refactor code and fixing issues of session and authentification  #7

Hi.

I am very grateful for the tutorial. I found some useful information on how to use radish from fives.
But at the same time, I found some of the code I suggest to change

I suggest making such changes:

Redirection rules
Separate views for login and main page
Fix session settings

i created pull request #5

So i think i`ll be userfull for people who using your tutorial.